is found, whose precise form was first determined by Brown and York
in the course of their field-theoretical generalization of Hamilton-Jacobi
theory [1]}. Given with respect to the canonical
variables \((h^{ab},P_{ab})\)  and \((\sqrt{q},\sinh ^{-1}\eta )\) , this
generalized gravitational Hamiltonian provides a feasible quasilocal
description of the total amount of energy-momentum of a gravitational
field with spatially and temporally finite dimensions, which represents
an alternative to more traditional pseudotensorial descriptions of
the subjectFor a detailed review, see for instance [2]}..
